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"algae" tablets do contain a significant amount of fish meal in them making them interesting to carnivorous fish too. If I were you I would give the otos a slice of cucumber or zucchini instead. I really doubt that any betta would try eating that...

I will be getting two more ottos today to complete the school in rose's tank from the same place as i got the other four. I called last night and they are already on hold for me.

This would be much better for the tank than the khuli loaches. Am also considering using a school of otto cats in the tank with the harlequin rasboras once the tank is ready for stocking. What do you think.

I just put one half inch slice of cucumber in for my five otos. Sometimes they don't touch it for half a day or so, so I leave it in there for two days in that case. They will pretty much finish it off in that time.

My otos are also verging on obese - if this is possible. Super fat happy bellies. I tried putting two slices in there, but they didn't eat one at all.

Also, you'll have to weight the slice down somehow so they can get to it.